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# 1 Semester Voabulary

TermDefinition
Chemical Change Rearranging molecules and atoms to form a new substance
Physical Change Occurs when the appearance of a substance changes, but chemically the substance is the same
Atom Basic Unit of matter that consists of dense central nucleus
Nucleus Central and most important part of an object
Atomic Number Number of Protons in the nucleus of an atom
Balanced Force When the total of all forces on an object equals zero
Unbalanced Force When the net force on an object is greater than zero
Speed Distance traveled by an object in a given amount of time
Velocity An objects speed and direction at a given instant
Force A push or a pull
Mass A unified body of matter with no specific shape
Volume The amount of space occupied by a three-dimensional object or region of space, expressed in cubic units
Density The quantity of something per unit measure, especially per unit length or volume.
Triple Beam Balance Measure mass of an object
Graduated Cylinder Accurate measurements of volume
Valance Electron an electron in the outer shell of an atom which can combine with other atoms to form molecules
Law of Conservation of Mass Law of Conservation of Mass is a relation stating that in a chemical reaction, the mass of the products equals the mass of the reactants.
Subscript a distinguishing symbol written immediately below or below and to the right or left of another character
Coefficient a number or quantity placed generally before and multiplying another quantity
Atomic Mass Mass of an atom of a chemical element expressed in atomic units
Created by: o1200035
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